Literature DB >> 23476398

Cinnarizinium fumarate.

C N Kavitha1, Sema Ōztūrk Yildirim, Jerry P Jasinski, H S Yathirajan, Ray J Butcher.   

Abstract

In the title salt {systematic name: 4-diphenyl-methyl-1-[(E)-3-phenyl-prop-2-en-1-yl]piperazin-1-ium (2Z)-3-carb-oxy-prop-2-enoate}, C26H29N2(+)·C4H3O4(-), the piperazine ring in the cation adopts a distorted chair conformation and contains a positively charged N atom with quaternary character. The dihedral angle between the mean planes of the phenyl rings of the diphenyl-methyl group is 74.2 (7)° and those between these rings and the phenyl ring of the 3-phenyl-prop-2-en-1-yl group are 12.7 (9) and 80.6 (8)°. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds form chains along [001]. Weak C-H⋯O inter-actions connect parallel chains along [010], forming layers perpendicular to the a-axis direction.

Entities:  

Year:  2012        PMID: 23476398      PMCID: PMC3588249          DOI: 10.1107/S1600536812051239

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For cinnarizine as a calcium channel blocker, see: Terland & Flatmark (1999 ▶), as a nootropic drug, see: Towse (1980 ▶) and for a clinical evaluation in various allergic disorders, see: Barrett & Zolov (1960 ▶). For related structures, see: Bertolasi et al. (1980 ▶); Dayananda et al. (2012 ▶); Jasinski et al. (2011 ▶); Mouillé et al. (1975 ▶); Siddegowda et al. (2011 ▶); Song et al. (2012 ▶). For puckering parameters, see: Cremer & Pople (1975 ▶). For standard bond lengths, see: Allen et al. (1987 ▶).

Experimental

Crystal data

C26H29N2C4H3O4 M = 484.58 Monoclinic, a = 21.9467 (4) Å b = 10.43729 (18) Å c = 11.20623 (19) Å β = 90.0458 (15)° V = 2566.95 (8) Å3 Z = 4 Cu Kα radiation μ = 0.67 mm−1 T = 123 K 0.60 × 0.30 × 0.25 mm

Data collection

Agilent Xcalibur (Ruby, Gemini) diffractometer Absorption correction: multi-scan (CrysAlis RED and CrysAlis PRO; Agilent, 2011 ▶) T min = 0.732, T max = 1.000 9777 measured reflections 5146 independent reflections 4289 reflections with I > 2σ(I) R int = 0.028

Refinement

R[F 2 > 2σ(F 2)] = 0.043 wR(F 2) = 0.121 S = 1.02 5146 reflections 333 parameters H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.27 e Å−3 Δρmin = −0.22 e Å−3 Data collection: CrysAlis PRO (Agilent, 2011 ▶); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXTL. Click here for additional data file. Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536812051239/zl2527sup1.cif Click here for additional data file. Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812051239/zl2527Isup2.hkl Click here for additional data file. Supplementary material file. DOI: 10.1107/S1600536812051239/zl2527Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C26H29N2+·C4H3O4F(000) = 1032
Mr = 484.58Dx = 1.254 Mg m3
Monoclinic, P21/cCu Kα radiation, λ = 1.54184 Å
Hall symbol: -P 2ybcCell parameters from 3517 reflections
a = 21.9467 (4) Åθ = 3.9–75.4°
b = 10.43729 (18) ŵ = 0.67 mm1
c = 11.20623 (19) ÅT = 123 K
β = 90.0458 (15)°Prism, colorless
V = 2566.95 (8) Å30.60 × 0.30 × 0.25 mm
Z = 4
Agilent Xcalibur (Ruby, Gemini) diffractometer5146 independent reflections
Radiation source: Enhance (Cu) X-ray Source4289 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.028
Detector resolution: 10.5081 pixels mm-1θmax = 75.6°, θmin = 4.0°
ω scansh = −23→27
Absorption correction: multi-scan (CrysAlis RED and CrysAlis PRO; Agilent, 2011)k = −12→8
Tmin = 0.732, Tmax = 1.000l = −13→13
9777 measured reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.043Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.121H atoms treated by a mixture of independent and constrained refinement
S = 1.02w = 1/[σ2(Fo2) + (0.0628P)2 + 0.4518P] where P = (Fo2 + 2Fc2)/3
5146 reflections(Δ/σ)max = 0.001
333 parametersΔρmax = 0.27 e Å3
0 restraintsΔρmin = −0.22 e Å3
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.
xyzUiso*/Ueq
O10.70117 (5)0.78316 (11)0.33222 (10)0.0323 (3)
O20.76739 (6)0.88857 (12)0.44702 (12)0.0446 (3)
O30.64077 (5)0.41055 (10)0.57965 (9)0.0298 (2)
O40.70688 (5)0.50977 (10)0.69945 (9)0.0272 (2)
N10.79869 (5)0.16984 (11)0.86255 (10)0.0208 (2)
N20.68573 (5)0.31174 (11)0.84519 (10)0.0200 (2)
C10.87241 (6)0.02312 (14)0.76576 (13)0.0237 (3)
C20.85173 (7)−0.09616 (15)0.80480 (14)0.0287 (3)
H2A0.8321−0.10280.87800.034*
C30.86015 (7)−0.20467 (16)0.73566 (16)0.0340 (3)
H3A0.8461−0.28370.76250.041*
C40.88951 (7)−0.19554 (17)0.62621 (16)0.0362 (4)
H4A0.8954−0.26850.58000.043*
C50.90995 (7)−0.07792 (18)0.58618 (15)0.0367 (4)
H5A0.9293−0.07160.51260.044*
C60.90159 (7)0.03164 (16)0.65610 (13)0.0288 (3)
H6A0.91560.11050.62910.035*
C70.86398 (6)0.14289 (13)0.84173 (12)0.0223 (3)
H7A0.88180.21580.79900.027*
C80.89718 (6)0.12793 (13)0.96069 (13)0.0241 (3)
C90.95738 (7)0.16951 (15)0.96988 (15)0.0315 (3)
H9A0.97590.20940.90520.038*
C100.98986 (8)0.15168 (18)1.07497 (17)0.0396 (4)
H10A1.03000.17961.08030.048*
C110.96277 (8)0.09271 (17)1.17150 (16)0.0402 (4)
H11A0.98470.08021.24160.048*
C120.90255 (8)0.05206 (15)1.16380 (14)0.0348 (4)
H12A0.88420.01271.22900.042*
C130.86965 (7)0.07003 (14)1.05883 (14)0.0280 (3)
H13A0.82930.04341.05420.034*
C140.79157 (6)0.29648 (13)0.91797 (12)0.0215 (3)
H14A0.80420.36240.86220.026*
H14B0.81740.30220.98810.026*
C150.72582 (6)0.31822 (13)0.95322 (11)0.0205 (3)
H15A0.71340.25351.01030.025*
H15B0.72170.40150.99080.025*
C160.69605 (6)0.18874 (13)0.78029 (12)0.0220 (3)
H16A0.67270.18880.70680.026*
H16B0.68200.11790.82900.026*
C170.76314 (6)0.17046 (14)0.75159 (12)0.0226 (3)
H17A0.76890.09010.70960.027*
H17B0.77710.23940.70030.027*
C180.61896 (6)0.32482 (14)0.87638 (12)0.0241 (3)
H18A0.59510.32750.80350.029*
H18B0.60620.25040.92170.029*
C190.60671 (6)0.44322 (14)0.94778 (13)0.0243 (3)
H19A0.61440.52290.91370.029*
C200.58525 (6)0.43782 (14)1.05838 (13)0.0234 (3)
H20A0.57860.35631.08920.028*
C210.57077 (6)0.54589 (14)1.13783 (12)0.0235 (3)
C220.57635 (6)0.67372 (15)1.10234 (13)0.0265 (3)
H22A0.59040.69261.02610.032*
C230.56116 (7)0.77284 (15)1.17925 (14)0.0307 (3)
H23A0.56510.85741.15430.037*
C240.54012 (7)0.74589 (16)1.29343 (14)0.0305 (3)
H24A0.52950.81231.34470.037*
C250.53502 (7)0.61982 (17)1.33073 (13)0.0318 (3)
H25A0.52130.60151.40730.038*
C260.55045 (7)0.52071 (15)1.25361 (13)0.0282 (3)
H26A0.54720.43631.27950.034*
C1000.73414 (7)0.79844 (14)0.43019 (13)0.0269 (3)
C1010.72630 (7)0.69456 (14)0.51966 (13)0.0253 (3)
H10B0.75100.69580.58710.030*
C1020.68628 (7)0.60047 (13)0.50916 (12)0.0233 (3)
H10C0.66270.59710.44020.028*
C1030.67661 (6)0.49876 (13)0.60193 (12)0.0222 (3)
H1N0.6971 (8)0.3776 (18)0.7921 (17)0.027 (4)*
H1O10.7076 (11)0.851 (2)0.279 (2)0.054 (7)*
U11U22U33U12U13U23
O10.0442 (6)0.0275 (5)0.0254 (5)−0.0047 (5)−0.0059 (4)0.0074 (4)
O20.0537 (8)0.0318 (6)0.0484 (7)−0.0153 (6)−0.0188 (6)0.0135 (5)
O30.0385 (6)0.0226 (5)0.0282 (5)−0.0041 (4)−0.0018 (4)−0.0003 (4)
O40.0407 (6)0.0207 (5)0.0201 (5)−0.0006 (4)−0.0027 (4)0.0004 (4)
N10.0217 (5)0.0202 (5)0.0204 (5)0.0032 (4)−0.0016 (4)−0.0015 (4)
N20.0219 (5)0.0201 (5)0.0180 (5)0.0036 (4)−0.0001 (4)0.0003 (4)
C10.0185 (6)0.0249 (7)0.0278 (7)0.0044 (5)−0.0032 (5)−0.0019 (5)
C20.0270 (7)0.0267 (7)0.0325 (8)0.0022 (6)0.0005 (5)−0.0027 (6)
C30.0296 (8)0.0264 (8)0.0461 (9)0.0017 (6)−0.0042 (6)−0.0054 (7)
C40.0295 (8)0.0349 (8)0.0443 (9)0.0068 (7)−0.0036 (6)−0.0173 (7)
C50.0304 (8)0.0484 (10)0.0313 (8)0.0058 (7)0.0020 (6)−0.0109 (7)
C60.0260 (7)0.0322 (8)0.0282 (7)0.0035 (6)−0.0005 (5)−0.0012 (6)
C70.0219 (6)0.0212 (6)0.0239 (6)0.0008 (5)−0.0003 (5)0.0009 (5)
C80.0247 (7)0.0198 (6)0.0280 (7)0.0055 (5)−0.0029 (5)−0.0042 (5)
C90.0253 (7)0.0306 (8)0.0387 (8)0.0035 (6)−0.0022 (6)−0.0071 (6)
C100.0272 (8)0.0444 (10)0.0473 (10)0.0080 (7)−0.0112 (7)−0.0136 (8)
C110.0448 (9)0.0386 (9)0.0372 (9)0.0195 (8)−0.0199 (7)−0.0115 (7)
C120.0511 (10)0.0252 (7)0.0282 (7)0.0105 (7)−0.0045 (7)−0.0010 (6)
C130.0320 (7)0.0218 (7)0.0303 (7)0.0024 (6)−0.0037 (6)−0.0006 (6)
C140.0234 (6)0.0208 (6)0.0202 (6)0.0014 (5)−0.0012 (5)−0.0009 (5)
C150.0235 (6)0.0216 (6)0.0163 (6)0.0026 (5)−0.0015 (4)−0.0003 (5)
C160.0241 (7)0.0223 (6)0.0197 (6)0.0016 (5)−0.0025 (5)−0.0015 (5)
C170.0246 (7)0.0238 (7)0.0193 (6)0.0043 (5)−0.0015 (5)−0.0023 (5)
C180.0205 (6)0.0282 (7)0.0237 (6)0.0026 (5)−0.0009 (5)0.0009 (5)
C190.0215 (6)0.0256 (7)0.0260 (7)0.0043 (5)0.0001 (5)0.0028 (6)
C200.0192 (6)0.0246 (7)0.0265 (7)0.0012 (5)−0.0012 (5)0.0011 (5)
C210.0177 (6)0.0283 (7)0.0246 (7)0.0001 (5)−0.0004 (5)−0.0003 (5)
C220.0239 (7)0.0303 (8)0.0253 (7)−0.0010 (6)0.0029 (5)0.0003 (6)
C230.0286 (7)0.0274 (8)0.0360 (8)−0.0003 (6)0.0004 (6)−0.0020 (6)
C240.0248 (7)0.0342 (8)0.0326 (8)0.0021 (6)0.0000 (5)−0.0100 (6)
C250.0320 (8)0.0402 (9)0.0233 (7)−0.0004 (7)0.0034 (5)−0.0021 (6)
C260.0282 (7)0.0292 (7)0.0271 (7)−0.0016 (6)0.0016 (5)0.0012 (6)
C1000.0291 (7)0.0233 (7)0.0284 (7)0.0019 (6)−0.0019 (5)0.0035 (6)
C1010.0285 (7)0.0244 (7)0.0230 (6)0.0033 (6)−0.0025 (5)0.0028 (5)
C1020.0297 (7)0.0209 (6)0.0194 (6)0.0045 (5)−0.0009 (5)−0.0011 (5)
C1030.0286 (7)0.0183 (6)0.0196 (6)0.0051 (5)0.0024 (5)−0.0012 (5)
O1—C1001.3240 (19)C12—H12A0.9300
O1—H1O10.94 (3)C13—H13A0.9300
O2—C1001.205 (2)C14—C151.5135 (18)
O3—C1031.2363 (18)C14—H14A0.9700
O4—C1031.2837 (18)C14—H14B0.9700
N1—C171.4675 (17)C15—H15A0.9700
N1—C141.4688 (17)C15—H15B0.9700
N1—C71.4790 (17)C16—C171.5194 (18)
N2—C161.4929 (17)C16—H16A0.9700
N2—C151.4976 (16)C16—H16B0.9700
N2—C181.5129 (17)C17—H17A0.9700
N2—H1N0.943 (19)C17—H17B0.9700
C1—C61.389 (2)C18—C191.497 (2)
C1—C21.395 (2)C18—H18A0.9700
C1—C71.5238 (19)C18—H18B0.9700
C2—C31.385 (2)C19—C201.327 (2)
C2—H2A0.9300C19—H19A0.9300
C3—C41.389 (3)C20—C211.472 (2)
C3—H3A0.9300C20—H20A0.9300
C4—C51.382 (3)C21—C261.397 (2)
C4—H4A0.9300C21—C221.398 (2)
C5—C61.398 (2)C22—C231.387 (2)
C5—H5A0.9300C22—H22A0.9300
C6—H6A0.9300C23—C241.389 (2)
C7—C81.5267 (19)C23—H23A0.9300
C7—H7A0.9800C24—C251.385 (2)
C8—C131.393 (2)C24—H24A0.9300
C8—C91.394 (2)C25—C261.390 (2)
C9—C101.389 (2)C25—H25A0.9300
C9—H9A0.9300C26—H26A0.9300
C10—C111.380 (3)C100—C1011.487 (2)
C10—H10A0.9300C101—C1021.323 (2)
C11—C121.391 (3)C101—H10B0.9300
C11—H11A0.9300C102—C1031.5010 (19)
C12—C131.392 (2)C102—H10C0.9300
C100—O1—H1O1110.6 (15)N2—C15—H15A109.7
C17—N1—C14107.31 (10)C14—C15—H15A109.7
C17—N1—C7112.44 (10)N2—C15—H15B109.7
C14—N1—C7109.95 (11)C14—C15—H15B109.7
C16—N2—C15110.08 (10)H15A—C15—H15B108.2
C16—N2—C18109.73 (11)N2—C16—C17111.02 (11)
C15—N2—C18112.20 (10)N2—C16—H16A109.4
C16—N2—H1N106.2 (11)C17—C16—H16A109.4
C15—N2—H1N108.8 (12)N2—C16—H16B109.4
C18—N2—H1N109.7 (11)C17—C16—H16B109.4
C6—C1—C2119.00 (14)H16A—C16—H16B108.0
C6—C1—C7119.86 (13)N1—C17—C16109.63 (11)
C2—C1—C7121.14 (13)N1—C17—H17A109.7
C3—C2—C1120.71 (14)C16—C17—H17A109.7
C3—C2—H2A119.6N1—C17—H17B109.7
C1—C2—H2A119.6C16—C17—H17B109.7
C2—C3—C4120.00 (16)H17A—C17—H17B108.2
C2—C3—H3A120.0C19—C18—N2111.86 (11)
C4—C3—H3A120.0C19—C18—H18A109.2
C5—C4—C3119.90 (15)N2—C18—H18A109.2
C5—C4—H4A120.1C19—C18—H18B109.2
C3—C4—H4A120.1N2—C18—H18B109.2
C4—C5—C6120.11 (15)H18A—C18—H18B107.9
C4—C5—H5A119.9C20—C19—C18121.87 (13)
C6—C5—H5A119.9C20—C19—H19A119.1
C1—C6—C5120.28 (15)C18—C19—H19A119.1
C1—C6—H6A119.9C19—C20—C21127.53 (14)
C5—C6—H6A119.9C19—C20—H20A116.2
N1—C7—C1111.23 (11)C21—C20—H20A116.2
N1—C7—C8110.08 (11)C26—C21—C22118.15 (14)
C1—C7—C8110.24 (11)C26—C21—C20119.13 (13)
N1—C7—H7A108.4C22—C21—C20122.72 (13)
C1—C7—H7A108.4C23—C22—C21120.93 (13)
C8—C7—H7A108.4C23—C22—H22A119.5
C13—C8—C9119.22 (14)C21—C22—H22A119.5
C13—C8—C7121.79 (13)C22—C23—C24120.09 (15)
C9—C8—C7118.95 (13)C22—C23—H23A120.0
C10—C9—C8120.44 (16)C24—C23—H23A120.0
C10—C9—H9A119.8C25—C24—C23119.81 (14)
C8—C9—H9A119.8C25—C24—H24A120.1
C11—C10—C9120.23 (16)C23—C24—H24A120.1
C11—C10—H10A119.9C24—C25—C26119.97 (14)
C9—C10—H10A119.9C24—C25—H25A120.0
C10—C11—C12119.84 (15)C26—C25—H25A120.0
C10—C11—H11A120.1C25—C26—C21121.03 (14)
C12—C11—H11A120.1C25—C26—H26A119.5
C11—C12—C13120.23 (16)C21—C26—H26A119.5
C11—C12—H12A119.9O2—C100—O1123.66 (14)
C13—C12—H12A119.9O2—C100—C101122.27 (14)
C12—C13—C8120.03 (15)O1—C100—C101114.07 (13)
C12—C13—H13A120.0C102—C101—C100123.96 (14)
C8—C13—H13A120.0C102—C101—H10B118.0
N1—C14—C15110.31 (11)C100—C101—H10B118.0
N1—C14—H14A109.6C101—C102—C103123.90 (13)
C15—C14—H14A109.6C101—C102—H10C118.0
N1—C14—H14B109.6C103—C102—H10C118.0
C15—C14—H14B109.6O3—C103—O4124.57 (13)
H14A—C14—H14B108.1O3—C103—C102118.50 (13)
N2—C15—C14110.00 (10)O4—C103—C102116.93 (12)
C6—C1—C2—C30.1 (2)C7—N1—C14—C15−173.18 (10)
C7—C1—C2—C3−179.34 (13)C16—N2—C15—C1454.01 (14)
C1—C2—C3—C40.1 (2)C18—N2—C15—C14176.51 (11)
C2—C3—C4—C5−0.4 (2)N1—C14—C15—N2−60.16 (14)
C3—C4—C5—C60.6 (2)C15—N2—C16—C17−54.01 (14)
C2—C1—C6—C50.1 (2)C18—N2—C16—C17−177.96 (10)
C7—C1—C6—C5179.51 (13)C14—N1—C17—C16−63.17 (14)
C4—C5—C6—C1−0.4 (2)C7—N1—C17—C16175.81 (11)
C17—N1—C7—C1−50.90 (15)N2—C16—C17—N159.32 (14)
C14—N1—C7—C1−170.41 (11)C16—N2—C18—C19176.75 (11)
C17—N1—C7—C8−173.39 (11)C15—N2—C18—C1954.05 (15)
C14—N1—C7—C867.10 (14)N2—C18—C19—C20−117.16 (14)
C6—C1—C7—N1119.21 (14)C18—C19—C20—C21−179.45 (13)
C2—C1—C7—N1−61.36 (17)C19—C20—C21—C26−177.76 (14)
C6—C1—C7—C8−118.38 (14)C19—C20—C21—C222.4 (2)
C2—C1—C7—C861.04 (17)C26—C21—C22—C23−1.1 (2)
N1—C7—C8—C1336.25 (18)C20—C21—C22—C23178.80 (14)
C1—C7—C8—C13−86.82 (16)C21—C22—C23—C240.1 (2)
N1—C7—C8—C9−145.97 (13)C22—C23—C24—C250.7 (2)
C1—C7—C8—C990.96 (16)C23—C24—C25—C26−0.5 (2)
C13—C8—C9—C101.0 (2)C24—C25—C26—C21−0.5 (2)
C7—C8—C9—C10−176.85 (14)C22—C21—C26—C251.3 (2)
C8—C9—C10—C11−0.1 (3)C20—C21—C26—C25−178.60 (13)
C9—C10—C11—C12−0.6 (3)O2—C100—C101—C102173.65 (16)
C10—C11—C12—C130.4 (2)O1—C100—C101—C102−5.8 (2)
C11—C12—C13—C80.5 (2)C100—C101—C102—C103−177.35 (13)
C9—C8—C13—C12−1.2 (2)C101—C102—C103—O3−175.41 (14)
C7—C8—C13—C12176.58 (13)C101—C102—C103—O44.2 (2)
C17—N1—C14—C1564.23 (13)
D—H···AD—HH···AD···AD—H···A
N2—H1N···O40.943 (19)1.740 (19)2.6750 (15)170.9 (17)
O1—H1O1···O4i0.94 (3)1.70 (3)2.6270 (15)168 (2)
C18—H18B···O3ii0.972.563.3839 (18)143
C15—H15A···O3ii0.972.473.3463 (18)151
C15—H15B···O2iii0.972.463.1941 (19)132
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
N2—H1N⋯O40.943 (19)1.740 (19)2.6750 (15)170.9 (17)
O1—H1O1⋯O4i 0.94 (3)1.70 (3)2.6270 (15)168 (2)
C18—H18B⋯O3ii 0.972.563.3839 (18)143
C15—H15A⋯O3ii 0.972.473.3463 (18)151
C15—H15B⋯O2iii 0.972.463.1941 (19)132

Symmetry codes: (i) ; (ii) ; (iii) .

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1.  Synthesis and crystal structure of ebastinium hydrogen fumarate.

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2.  4-(Pyrimidin-2-yl)piperazin-1-ium (E)-3-carb-oxy-prop-2-enoate.

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